9172728 has 24 divisors (see below), whose sum is σ = 24843000. Its totient is φ = 3057552.

The previous prime is 9172727. The next prime is 9172739. The reversal of 9172728 is 8272719.

9172728 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 9172692 and 9172701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9172721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63628 + ... + 63771.

It is an arithmetic number, because the mean of its divisors is an integer number (1035125).

Almost surely, 2^9172728 is an apocalyptic number.

It is an amenable number.

9172728 is an abundant number, since it is smaller than the sum of its proper divisors (15670272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9172728 is a wasteful number, since it uses less digits than its factorization.

9172728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127411 (or 127404 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 9172728 is about 3028.6511849336. The cubic root of 9172728 is about 209.3306579596.

Subtracting from 9172728 its reverse (8272719), we obtain a palindrome (900009).

The spelling of 9172728 in words is "nine million, one hundred seventy-two thousand, seven hundred twenty-eight".